test: Add --sit option to Avocado test runner
test: Add --sit option to Avocado test runner

Like for test/verify/check-*, this is useful for debugging failures.

Closes #7075 
mareklibra/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,Scribery/cockpit,mvollmer/cockpit,harishanand95/cockpit,petervo/cockpit,andreasn/cockpit,larskarlitski/cockpit,mvollmer/cockpit,andreasn/cockpit,cockpituous/cockpit,larsu/cockpit,petervo/cockpit,petervo/cockpit,stefwalter/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,petervo/cockpit,andreasn/cockpit,larskarlitski/cockpit,deryni/cockpit,garrett/cockpit,harishanand95/cockpit,stefwalter/cockpit,garrett/cockpit,andreasn/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpituous/cockpit,Scribery/cockpit,xhad/cockpit,xhad/cockpit,andreasn/cockpit,xhad/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,petervo/cockpit,michalskrivanek/cockpit,andreasn/cockpit,xhad/cockpit,stefwalter/cockpit,petervo/cockpit,larsu/cockpit,harishanand95/cockpit,andreasn/cockpit,mareklibra/cockpit,larsu/cockpit,xhad/cockpit,stefwalter/cockpit,petervo/cockpit,cockpituous/cockpit,deryni/cockpit,SotolitoLabs/cockpit,deryni/cockpit,mvollmer/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,xhad/cockpit,moraleslazaro/cockpit,deryni/cockpit,larskarlitski/cockpit,cockpituous/cockpit,larskarlitski/cockpit,larsu/cockpit,moraleslazaro/cockpit,Scribery/cockpit,garrett/cockpit,cockpituous/cockpit,Scribery/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,garrett/cockpit,larskarlitski/cockpit,deryni/cockpit,mareklibra/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,michalskrivanek/cockpit,larskarlitski/cockpit,michalskrivanek/cockpit,martinpitt/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,mareklibra/cockpit,harishanand95/cockpit,deryni/cockpit,garrett/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpituous/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,mareklibra/cockpit,harishanand95/cockpit,larsu/cockpit,cockpit-project/cockpit,xhad/cockpit,Scribery/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,michalskrivanek/cockpit,deryni/cockpit,Scribery/cockpit,mareklibra/cockpit,harishanand95/cockpit,larsu/cockpit